• 대한방사선기술학회지:방사선기술과학
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• 제21권2호
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• pp.5-10
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• 1998

In the mammography, X-ray beam quality is one of the most important factors. Using X-ray mammography unit model GE/CGR Senography 600T Senix H.F, Authors studied four subjects. 1. The aluminum attenuation rate in 30 kVp when used with or without compression plate. 2. HVLs at 5 different area of the X-ray field of $26{\sim}32kVp$. 3. HVLs to know the influence of corrected measurement or parallel measurement. 4. Film density with microdensitometer along and cross to the long axis of X-ray tube, in terms of the Heel effect in the X-ray field. The following results were obtained. 1. Beam quality of anode area was harder than cathode area. 2. The dose reduction rate of compression plate was approximately $65.5%{\sim}88.1%$ and the beam quality with compression plate was hardened up to 4kVp accordingly. 3. If the X-ray beam enters the attenuation plate obliquely, HVL was $2.6{\sim}2.9%$ harder than perpendicular to it. 4. Because of heel effect, the film density of cathode area is higher than anode area to film density of 0.5.

• Korean Journal of Acupuncture
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• 제23권2호
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• pp.79-88
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• 2006

X-선상(線像) 배수혈 진단을 통한 요각통의 침구(鍼灸) 치험 3례(例)로 다음과 같은 지견을 얻었다. 1. 요배통의 치료에 단순 x-ray 영상을 한의학적으로 활용할 수 있다. 2. 단순 x-ray 영상의 척추분절 극돌기의 아탈구(subluxation)는 해당되는 배수혈 및 경락의 병변으로 진단될 수 있다. 3. 아탈구(subluxation)된 극돌기의 배수혈에 해당되는 경락의 합혈과 원혈을 사용할 경우 진단된 배수혈 수준의 척추분절이 교정될 수 있다.

• 한국항행학회논문지
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• 제27권6호
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• pp.733-739
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• 2023

이 연구의 목적은 인천국제공항 보안검색요원 X-ray 판독등급제 적용 효과를 규명하는 것이다. 데이터는 인천국제공항 보안검색요원 1,034명을 대상으로 수집하였다. 데이터 분석은 대응표본 t-test를 사용하였다. 연구 결과는 X-ray 판독등급제 적용 전·후 통계적으로 유의미한 차이가 있는 것을 발견하였다. 이 논문에서 우리는 X-ray 판독등급제가 보안검색요원들의 X-ray 판독 능력 향상에 효과적임을 주장한다. 이 논문은 동기부여 이론과 자기 결정성 이론을 확장한 학문적 기여와 보안검색요원 X-ray 판독등급제 적용을 위한 실무적 시사점을 제공하는 선제적 실증연구로서 가치가 있다.

• 대한방사선기술학회지:방사선기술과학
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• 제20권1호
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• pp.91-96
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• 1997

Male rats of Albino strain were divided into four groups. The radioprotective effect of treatment with S-2(3-aminopropylamino)ethylphosphorothioic acid(WR-2721) using the dose of 200 mg/kg by intraperitonial injection on rats for 20 min prior to whole body x-ray irradiation (8 Gy) was studied. The harzardous effects of x-ray irradiation were greatly corrected In the treated group. The concentrations of total serum cholesterol, HDL-cholesterol, triglyceride, and phospholipid were greatly affected, showing insignificant changes in the treated group of animals. The drastic hyperglycemic effect of x-ray irradiation in the untreated group decreased to a normal level. These results show the potentiality of WR-2721 as a radioprotective agent.

• 대한방사선기술학회지:방사선기술과학
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• 제38권1호
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• pp.39-49
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• 2015

격자 간섭계(grating interferometer)는 방사선 영상분야의 새로운 기술로서, 흡수 영상(absorption imaging)뿐만 아니라 위상차 영상(phase contrast imaging)과 다크필드 영상(dark field imaging)을 제공한다. 격자 간섭계는 크게 탈봇 효과(talbot effect)를 이용하는 탈봇 간섭계와 탈봇-라우 효과(talbot-lau effect)를 이용하는 탈봇-라우 간섭계로 나뉘는데, 일반적인 방사선 영상시스템과 달리 방사선의 간섭을 예측하고 적용하는 것이 중요하다. 본 연구에서는 현재 부산대학교 중성자 및 방사선 공학 연구실에서 보유하고 있는 엑스선 격자 세트와 중성자 격자 세트를 이용하여 탈봇 간섭 패턴 및 탈봇-라우 간섭 패턴을 제작하였다. 이를 통해 방사선의 파동 거동에 따른 간섭 세기의 변화를 예측하고, 격자 간섭계를 구성하는 각 요소들을 계산했다. 그리고 격자의 종류 및 위상차 물체에 대한 탈봇 간섭 패턴 및 탈봇-라우 간섭 패턴을 예측하였다.

• 전기학회논문지
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• 제59권9호
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• pp.1611-1614
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• 2010

The explosion of a nuclear weapon radiates a gamma-ray in the form of a transient pulse. If the gamma-ray introduces to semiconductor devices, much Electron-Hole Pairs(EHPs) are generated in depletion region of the devices[7]. as a consequence of that, high photocurrent is created and causes upset, latchup and burnout of semiconductor devices[8]. This phenomenon is known for Transient Radiation Effects on Electronics(TREE), also called dose-rate effects. In this paper 3D structure of inverter and NAND gate device was designed and transient pulse gamma-ray was modeled. So simulation for transient radiation effect on inverter and NAND gate was accomplished and mechanism for upset and latchup was analyzed.

• 천문학회보
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• 제36권1호
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• pp.35.1-35.1
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• 2011

The solar X-ray telescopes, the Yohkoh SXT and the Hinode XRT, have observed for a couple of decades a variety of coronal structures in the range of wide field-of-view (FOV) covering the full solar disk. It has been emphasized that the optical structure of solar telescopes should be designed with care for improving the uniformity over the full FOV. The vignetting effect is one of the important optical characteristics for describing the performance of a telescope, which reflects the ability of collecting the incoming light at different locations and different photon energies. The correction of this vignetting effect would be an important calibration step that should be performed in advance, especially when the observed images are to be used for photometric purposes. Since the vignetting effect of solar X-ray telescopes shows wavelength dependence, a special care should be taken when, for example, performing the temperature analyses with thin and thick filters for flaring activities observed at the periphery of the full FOV. The results of analysis of pre-launch calibration data for the evaluation of vignetting effect will be introduced in detail.

• 전기의세계
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• 제13권3호
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• pp.13-20
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• 1964

The measurements of X-ray and Gamma-ray Dose Rate have been successfully made by measuring the short circuit current of the Silicon P-N Junction Diode being irradiated. The short circuit current flows when a silicon P-N Junction Diode is irradiated by X-ray of Gammaray radiations due to photovoltaic effect. A brief analysis is given in order to verify the proportionality of a short circuit current to the Dose Rate. Using this method, measurements of X-ray Dose Rate were carried out in the range of 0.05-1600 r/m successfully. The calibration was made by comparing with Victoreen condenser r-meter. Some advantages in this Dose Rate meter over a condenser r-meter were found. One can measure a continous variation of X-ray Dose Rate with this rate meter at the control console of X-ray device.

• 방사선산업학회지
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• 제8권1호
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• pp.1-5
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• 2014

This study investigated the reduction of microbial population and sensory properties in red pepper powders irradiated by gamma ray, electron beam, and X-ray. Populations of total aerobic bacteria and yeast & molds in red pepper powders were decreased by irradiation treatment in a dose-dependent manner. Gamma ray, electron beam, and X-ray at doses above 8 kGy caused 100% inhibition on growth of aerobic bacteria in red pepper powders. Inhibitory activity of X-ray on sterilization of red pepper powders was significantly equal to or higher compared to gamma ray and electron beam. Color and off flavor in red pepper powders were no significant difference among the control and samples irradiated with gamma ray, electron beam, and X-ray. As a result, the gamma ray, electron beam, and X-ray irradiation can be used to sterilize the microbial growth in red pepper powders without quality loss.

• 한국세라믹학회지
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• 제20권3호
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• pp.250-254
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• 1983

The effects of the various amount of $CeO_2$ $MnO_2$ and $Fe_2O_3$ added to the high lead-silicate glasses on the X-ray induced coloration were studied. The light transmissions and chromaticities of the glasses before and after exposing to X-ray radiation were measured to investigate the effects by additivies. The results are as follows ; 1. High lead-silicate glass added $CeO_2$ or $MnO_2$ has a little effect on the transmission but has a considerable effect on the chromaticity. The chromaticies of 56.6wt% PbO content glasses were changed as 3-7 times as those of 28.3wt% PbO content glasses. 2. By the X-ray irradiation glasses containing 0.2-0.5wt% $CeO_2$ were changed the least in chromaticity that is the most effective in preventing the X-ray induced coloration. 3. By X-ray irradiation $MnO_2$ reduced the transmissions and showed purple coloration. 4. Transmission change amounts of the glasses added $CeO_2$ and $Fe_2O_3$ were less than those of the glasses added $CeO_2$ alone by X-ray irradiation.